Hiei as of 1933:
Between July 1931 and December 1933 Hiei underwents further refit works. All starboard 76mm guns are replaced by two twin 127mm guns. The entire casemate secondary battery was removed, as well as the main gun director.

Hiei as of 1935:
Between January 1934 and March 1935 Hiei underwent works in preparation of her incumbent remilitarization. All casemate guns were re-imbarked along with the main gun director. The forward superstructure was further built up and the shell room for the n°4 turret reconstructed. Awaiting for the turret itself to be fitted back in the barbette is loaded with ballast, with draft increasing to pre-demilitarization levels.

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Hiei as she looked in 1928:
From October to November 1927 Hiei was refitted to be able to accomodate and operate two Yokosuka E1Y floatplanes. During the same works, the forward superstructure was also further expanded with the addition os two more searchlight platforms, lookout stations and a battle bridge.

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Sources and documentations are the most welcome.